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286
MORPHOLOGY AND EVOLUTION
C.S.  S,P.S
S.S.
M.F.S
S.F.S
O.S.
I.P.S;
F-OJ5. S.L.S.
0-T.S.
B
FIG. 50.—The brain in the Hoolock Gibbon (A) and Orang-Outan (B). The true relations of the parieto-occipital (veide) and simian sulci (narrow) are shown in C. O.K., orbital keel. Other letters explained in text.